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Delineation of the dup5q phenotype by molecular cytogenetic analysis in a patient with dup5q/del 5p (cri du chat).
American Journal of Medical Genetics 2002 March 16
An infant girl presented with multiple congenital abnormalities and a distinctive mewing cry. Her karyotype was 46,XX,add5p. Chromosome analysis on the mother revealed an apparently balanced pericentric inversion of chromosome 5, with the precise position of the breakpoints not clearly discernable by GTG banding, 46,XX,inv(5)(p15.2/3?q35.1?). Fluorescence in situ hybridization (FISH) studies using a commercial cri du chat probe (D5S721,D5S23) revealed signals on both the normal and derivative chromosomes. Telomeric probes specific for 5p and 5q were used to confirm the pericentric inversion in the mother and demonstrated the loss of the terminal 5p region and a duplication of the terminal 5q region in the proband. The imbalance on chromosome 5 in the patient was further defined using comparative genomic hybridization (CGH), which revealed a loss of material from 5p15.3 --> pter and a gain of 5q34 --> qter. The presence of the cat-like cry appears to be the only specific feature that can be linked to the loss of 5p material. The remaining dysmorphic features of this infant appear to be due specifically to the duplication of the 5q sequences. The combination of FISH, CGH, and cytogenetics has confirmed that the characteristic cry of the cri du chat syndrome is due to the deletion of the most distal part of the classic del 5p region. More importantly, our investigation has defined the duplication of 5q34 --> qter as a distinct clinical phenotype.
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